Land that (i) is not located in a unit of local government with a population greater than 500,000, (ii) is located within 15 yards of waters listed by the Department of Natural Resources under § 5 of the Rivers, Lakes, and Streams Act as navigable, and (iii) has not been clear cut of trees, as defined in § 29a of the Rivers, Lakes, and Streams Act, shall be valued at 1/12th of its productivity index equalized assessed value as cropland.